David Miller <da...@davemloft.net> writes: Technically we could use this on some chips we don't distinguish on a fine enough granularity yet. For example we can assume popc is available on T2 as well as UltraSPARC-IV. But for now, just T3 and later. I suppose we should mention this as a comment in the code.
I think that popc runs in the multiplier unit on T4, and thus has
similar characteristics. It fully pipelines but has a latency of
12 cycles.
That's one deep pipeline!
2013-03-22 David S. Miller <da...@davemloft.net>
* mpn/sparc64/ultrasparct3/hamdist.asm: New file.
* mpn/sparc64/ultrasparct3/popcount.asm: New file.
The code is in. Thanks for this contribution! I also updated the
asm.html tables. You have a lot of work to do before the T4 column is
filled in with optimal code...
I actually wrote a v9 popcount a while back. It is about 5 times as
large as yours, and I don't think it runs faster enough be worth it.
I attached it anyway.
sparc64-popcount.asm
Description: Binary data
-- Torbjörn
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